[PATCH AUTOSEL 6.14 264/642] dpll: Add an assertion to check freq_supported_num

Sasha Levin
2025-05-05T22:25:11Z

From: Jiasheng Jiang <jiashengjiangcool@gmail.com>

[ Upstream commit 39e912a959c19338855b768eaaee2917d7841f71 ]

Since the driver is broken in the case that src->freq_supported is not
NULL but src->freq_supported_num is 0, add an assertion for it.

Signed-off-by: Jiasheng Jiang <jiashengjiangcool@gmail.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Reviewed-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Link: https://patch.msgid.link/20250228150210.34404-1-jiashengjiangcool@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/dpll/dpll_core.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/dpll/dpll_core.c b/drivers/dpll/dpll_core.c
index 1877201d1aa9f..20bdc52f63a50 100644
--- a/drivers/dpll/dpll_core.c
+++ b/drivers/dpll/dpll_core.c
@@ -443,8 +443,11 @@ static void dpll_pin_prop_free(struct dpll_pin_properties *prop)
static int dpll_pin_prop_dup(const struct dpll_pin_properties *src,
struct dpll_pin_properties *dst)
{
+ if (WARN_ON(src->freq_supported && !src->freq_supported_num))
+ return -EINVAL;
+
memcpy(dst, src, sizeof(*dst));
- if (src->freq_supported && src->freq_supported_num) {
+ if (src->freq_supported) {
size_t freq_size = src->freq_supported_num *
sizeof(*src->freq_supported);
dst->freq_supported = kmemdup(src->freq_supported,
--
2.39.5